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Fall Asleep After the Last Thrust

We know: You hate to give up on one minute of postcoital pillow talk, but ultimately you're going comatose for her. Your penis needs as much shut-eye as it can get.

Every night while you sleep, you have between three and five hour-long erections. You probably noticed this phenomenon the last time you had to pee at 4 a.m. Those erections are not there just to make life interesting for your bedmate. They work to recharge your penis—keeping it well nourished with oxygenated blood. "Theoretically, the more nocturnal erections you have, the more flexible your erectile tissue will become. And that may help keep erections strong as the years wear on," explains Dr. Goldstein.